LG MDT505 - No Audio Check Flow

3-5
ELECTRICAL TROUBLESHOOTING GUIDE
3. NO AUDIO CHECK
NO
CD/DVD Disc
or USB play.
Check IC500.
IC602 Pin4, 5,
6, 7, 8 I2S input
signal ok?
NO
Check IC602.
IC602 I2S
output signal
ok?
YES
YES
A
NO
NO
HEADPHONE output.
Check IC301.
Check CN301 and
Connection.
IC301
Pin 1, Pin 7
audio signal
ok?
Front Board
CN301 Pin1,3 audio
signal ok?
YES
YES
NO
AUX function.
Check JK201.
IC200
Pin7,8 audio
L/R ok?
YES
B
NO
PORTABLE function.
Check JK301.
Check Front Board stage
and JK301.
IC200
Pin21, 22 audio
L/R ok?
YES
B